Tool setting height gauge



March 1947. A. F. o. cALow TOOL SETTING HEIGHT GAfiGE Filed June 8, 1944 2 Sheets Sheet l JNVENTOR. 4502 2 0 Ciazaw':

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March 11, 1947, A. F. o. CALOW TOOL SETTING HEIGHT GAUGE Filed June 8. 1944 2 Sheets-Sheet 2 INVENTOR. A/iflrzv (5250M zwmww Patented Mar. 11, 1947 UNITED STATES PATENT OFFICE TOOL SETTING HEIGHT GAUGE Andreas Frederick Otto Calow; Albany, N. Y.

nnlichfionJuneB; 1944, s ri li kl' -ji iziiq 01M 1 33-18 This invention relates. to gauges and. refers,

more particularly to a gauge for setting the height of a cutting tool in a lathe.

It is understood that the. height of the tool is critical in producing good work, the tool being.

set at center height formost work and other tool heights being set with reference to center height. A very small deviation from ideal height seriously impairs efficiency, and practice in setting the tool on center has been to bring thetool closely adjacent to the live or dead center in-order-to match the height accurately, or tobrinsthedea Center closelyadjacent to the tool for the same purpose. Both of these procedures may be, inconvenient for reasons too numerous to mention.

An object of the present invention is to provide a means of setting the height ofjthe cutting tool without having to bring the toollto the tip of the live or dead center.

Another object is to provide a means of centering work in a universal chuck or other adjustable work holder.

Another object is to provide a machinists tool suited to the above purpose and also to many uses of a surface gauge.

Other objects will become apparent from the following specification.

In accomplishing the objects of the present invention it was found desirable to provide an elongated block of metal bearing at one end a vertical standard. On the standard is a rotating sleeve with a longitudinal slot similar to a keyway. Sliding vertically on the sleeve is an arm with a manually operated setscrew projecting into the slot, for locking the arm at any given height. On the tip of the arm is a pointer pivoted at one end to rotate in a plane parallel with the arm. A plurality of magnets are set flush in the under surface of the block.

In operation the block is set on the flat top of the lathe carriage between the toolpost and the center whose height is being used to set the height of the tool. The tip of the pointer is brought adjacent to the tip of the center by rotating the arm or the pointer or both, and is locked at the correct height by the setscrew. The tip of the pointer is then brought adjacent the tip of the tool by rotating the arm or the pointer or both, and the tool may now be conveniently set at the height of the pointer.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings, showing, by way of example, preferred embodiments of the inventive idea.

In he raw n s.

Figured is a plan view ofthe invention being used to set the height of the tool from the dead center.

F ur a sideel v on i he t n,

Figure 3. is. an enlarged partial side elevation of theinvention. partially in section,

Figure 4 is, a horizontal section along the line 41-4 of Figure 2 Fi ure 5 is a orizo talseciioh l ha the lie 18v and chip cover 8; fastened, thereto. The tai1-.

stock I5, quill Hand dead center l3. are shown mov d n f rl los t the work. et h suflh cient space between it and theheadstock. It to permit a wide variety of chuck work, faceplate work and work between centers. Tool post l9 receives tool holder 20 which receives tool 2|. All the above is conventional.

The invention is shown on the flat surface I! of the carriage 1 between the toolpost and the dead center. The base of the gauge is the block 4| which has holes 31 in its under surface 39 to receive magnets 38 which hold it in place on any magnetic surface even when the arm and pointer are extended perpendicular to the block. The block is of hardened construction and may be clamped in a toolpost when being used in other applications. The end portion 35 of the block has been relieved considerably from the top surface 40 in order to permit a greater downward adjustment of the arm as described hereafter. Cylindrical standard 3|, with collar 34, is fixed in vertical position on end portion 35 by counter sunk screw 36. Sleeve 32 slips snugly over standard 3| and is micrometrically shorter, so that collar 28 held by screw 21 bears on standard 3| rather than on sleeve 32, and sleeve 32 has substantially no axial movement but rotates freely. Sleeve 32 bears an exterior recess in the form of a longitudinal slot 33. The arm 28 has on one end a downwardly extending sleeve 30 which slips snugly on sleeve 32 and is threaded for a setscrew 29 which engages slot 33. Since collar 34 has the same outside diameter as sleeve 32 sleeve 30 can be slipped down as far as portion 35. A series of holes 42 in arm 26 provide lightness. The outer end of arm 26 is threaded for screw 24 which has a shoulder 25 between the thread and head which shoulder is micrometrically higher than the thickness of pointer 23, so that pointer 23 pivots freely 29. This height can now be transferred to the tool by swinging arm 26 or as illustrated swinging pointer 23, or by swinging both.

For precision transfer of height, the arm willbe set so that the top or bottom surface of the A gauge, comprising, in combination, an elongated base including a substantially heavy body portion and an end portion located upon one side of said body portion and being of lesser height than said body portion, magnets in said body portion for holding the gauge upon a magnetizable surface, a cylindrical standard vertically mounted on said end portion, said end portion having a counterbore formed thereinforreceiving the lower end of said standard, said'standard having an enlarged collar portion adjacent the lower end thereof and engaging the upper surface of the end portion of said base, a tubular sleeve swingably mounted upon said standard, the diameter of said sleeve being the same as that of the collar 7 portion, whereby said sleeve forms a continuous pointer is in the horizontal plane of the deadcenter point.

It may be found convenient to use point 44 for setting the height of the arm, and the corner point 43 in setting the height of the tool, or vice versa if the height is being taken from the live center, in which case the block 4| would be on the surface (6 of carriage l. V

The gauge may obviously be used to center a piece of work ina chuck or on a face plate.

By the use of a shim between collar 28 and sleeve'32 or other means of making sleeve 32 rotate less freely, the gauge may be used in many applications as a surface gauge.

It is apparent that the specific illustration shown above has been given by way of illustrationand not by way of limitation, and that the structures above described are subject to wide variation and modification without departing from the scope or intent of the invention, all of which variations and modifications are to .be included within the scope of the present invention.

What is claimed is:

the corner supporting surface therewith, means preventing substantial axial movement of said sleeve on said standard while permitting rotation of said sleeve on said standard, an arm having a sleeve portion swingably and slidably mounted on said sleeve, means for locking the sleeve portion of said'arm at various heights on said sleeve, and a pointer swingably mounted upon the outer end of said arm.

, A. F. o'rro CALOW.

REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS Number Name. Date 1,804,421 Klopsteg May 12, 1931 437,308 Markhamv Sept. 30, 1890' 1,322,302 Knab Nov. 18, 1919 303,782 Wright Aug. 19, 1884 1,778,481 Boucher Oct. 14, 1930 I Lloyd May, 9, 1922 

